HA 5200
12/2014
M20 x 1,5 • p
max
350 bar • Q
max
30 L/min
Overcentre Valve
SO5A-Q3/l
Replaces
HA 5200 7/2008
q
The valve prevents runaway in the event of a nega
-
tive load
q
Load-holding without leakage
q
Pressure relief function protecting the actuator
against overload and pressure peaks
q
When installed into the actuator the valve can be
used as a hose burst valve
q
When used as pressure relief the check valve will
act as an anti-cavitation valve
q
The valve should be mounted as close as possible
to the actuator
q
Fits the same cavity as the Q3 check valve
1
2
3
The valve consists of a seat by-pass, relief valve fitted
with an auxiliary control with a differential piston and
by-pass single-way valve serving for reverse direction
of flow. The liquid is flowing through the single-way valve
from the channel (2) to the channel (1) with a small
pressure drop. In the opposite direction the single-way
valve on the rear side of which a gate valve seat is fitted is
pressed through the action of a spring and the load
pressure against the spring-loaded valve gate valve.
In this way the valve is nearly closed hermetically.
If the pressure in the channel (1) exceeds a set up value
of the spring force the gate valve is pressed out
of the seat and the overpressure in that case is relieved
into channel (2). For ensuring the function of holding
the load the spring force should be set up to a value by
30 % higher when compared to an expected pressure
exerted by the load.
If the load has to be moved it is possible to ensure it
with the help of so called auxiliary control from
the channel (3) by introducing already certain control
pressure.
The control pressure is calculated in the following way:
Control pressure =
The ratio of control designates a ratio of surfaces
of the differential slide valve cross-section area and its
seat. Therefore, the necessary control pressure
for opening the valve does not correspond to
the difference between the set up pressure and load
pressure however; it corresponds to the ratio of this
difference and the control ratio. In the formula as
mentioned above it is necessary to take into
consideration that in differential cylinders it is necessary
to add to the control ratio also the appropriate ratio
of piston surfaces in the direction of movement.
As soon as the control pressure attains a necessary value
the differential gate valve is moved out from the seat
and then the way from the channel (1) to the channel (2)
is released. If now the load tries to accelerate and be fast
as for the oil supply the supply pressure decreases,
therefore, also the control pressure in the channel (3) is
decreased. The spring force tries to shut off the valve
again, therefore, in consequence of which the flow
from the consumer decreases and the inlet pressure
to the consumer increases again. In this way it is ensured
aconstant inlet pressure by means of which
the movement of the load can be controlled.
As for appropriate basic surface finish the external parts
are zinc coated.
set up pressure – load pressure
ratio of control
Functional Description
0 10 20 30 40 50
50
40
30
20
10
0
FREE FLOW
PILOT OPEN
0 2.5 5 7.5 10 12.5
750
600
450
300
150
0
0 2.5 5 7.5 10
FREE FLOW
PILOT OPEN
0 10 20 30 40
Pressure p barD []
Flow Q L/min[]
Flow Q US GPM[]
Pressure p PSID []
Flow Q L/min[]
Flow Q US GPM[]
2
HA 5200
Ordering Code
SO5A-Q3/l
Overcentre Valve
NBR No designation
Pilot ratio
For applications with varying load 2,5:1
2
Standard 5:1 5
For applications with a constant load 10:1 10
Technical Data
Cavity M20 x 1,5
Maximum flow L/min 30
Max. pressure bar 270
Max. input pressure bar 350
Pressure drops bar see Dp - Q characteristics
Hydraulic fluid Hydraulic oil (HL, HLP) according to DIN 51524
Fluid temperature range °C -20 ... +90
Viscosity mm
2
/s 20 ....400
Maximum degree of fluid contamination according to ISO 4406, Class 21/18/15
Weight kg 0,15
Maximum valve tightening torque
in valve body or in control block
Nm 45
+2
Mounting position Unrestricted
Dp-Q Characteristics Measured at n = 40 mm
2
/s
3
2
1
6HR4
6HR17
6HR25.4(1”)
M20x1.5-6g
47.0 MAX
42.5
3
HA 5200
Cavity Measurements in millimeters
A
Æ
Æ
Æ
16.05
16.00
Æ 15.00 MAX
17.55
17.50
M20x1.5-6H
21.90
21.80
Æ 30
15°
13.5
2.80
2.40
30.0
11.0
43.0
45°
13.5
30.0
40.0
Æ
8.0
MAX
Æ
4.0
1.6
0.08
1.6
0.3
1.6
1.6
Æ 0.05
-A-
Æ 0.08
B
A
B
Æ 0.08
30°
30°
A
HEX 4.0
HEX 17.0
HEX 25.4
M20 x 1,5-6g
Dimensions Measurements in millimeters
4
HA 5200
Caution!
The packing foil is recyclable.
The technical information regarding the product presented in this catalogue is for descriptive purposes only. It should
not be construed in any case as a guaranteed representation of the product properties in the sense of the law.
Subject to alteration without notice!
ARGO-HYTOS s.r.o. CZ - 543 15 Vrchlabí
Tel.: +420-499-403111, Fax: +420-499-403421
E-mail: sales.cz@argo-hytos.com
www.argo-hytos.com
ISO A
The use of aluminium bodies is limited to a maximum operating pressure of 210 bar.
Dual body without valve
Material Ports Port size Type code
Aluminium
C1, C2, V1, V2 G3/8 SB-Q3-0203AL
C1, C2, V1, V2 SAE 8, 3/4-16 SB-Q3-0204AL
Steel
C1, C2, V1, V2 G3/8 SB-Q3-0203ST
C1, C2, V1, V2 SAE 8, 3/4-16 SB-Q3-0204ST
Valve Bodies Measurements in millimeters
Spare Parts
Seal kits on request.
Body without valve
Material Ports Port size Type code
Aluminium
1, 2 G3/8
SB-Q3-0103AL
3 G1/4
1, 2 SAE 8, 3/4-16
SB-Q3-0104AL
3 SAE 6, 9/16-18
Steel
1, 2 G3/8
SB-Q3-0103ST
3 G1/4
1, 2 SAE 8, 3/4-16
SB-Q3-0104ST
3 SAE 6, 9/16-18
